640 DPI > 480 dpiWith a 5.7" Quad HD 2560x1440 display, I think we can utilize more screen real estate. This is how I like things to be. Of course your phone must be rooted and you have a file manager with root privilege and Xposed framework installed plus App settings module.First with the file manager go to /system/build.prop edit and change ro.sf.lcd_density=640 to 480 also you can use build.prop editorhttps://play.google.com/store/apps/details?id=com.jrummy.apps.build.prop.editorThen you have some Samsung Apps backed exclusive for 640 DPI so it will not show properly because they don't support multi DPI so open App settings module and change back the following to original DPI which is 640:1- Camera2- Contacts and InCallUI for phone, contacts, in call UI3- com.android.keyguard and for this one also check the option (apply res to widget) to show the lock screen properly aligned.

BTW the notification icon I changed it to AOSP style using Xstana module (Xposed) there is also options for HTC, Sony, etc